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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Allowance for doubtful accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (567) $ (776)
Provision for bad debts (41) 14
Net write-offs, net of recoveries (31) 40
Ending balance $ (639) $ (722)